. Annual report. New York State Museum; Science; Science. 102 NEW YORK STATE MUSEUM The linear type of lake is by far the most common,, this being pre- eminently true of the Finger lakes and to a large extent of the Adirondacks. It is well known that most of the larger lakes, espe- cially those of the linear type, occupy portions of preglacial stream channels. All the existing lakes are due, either directly or indi- rectly, to glacial action, and among the ways by which such bodies of water were formed are these: by building dams of glacial drift across old river channels; by ice erosion; and
. Annual report. New York State Museum; Science; Science. 102 NEW YORK STATE MUSEUM The linear type of lake is by far the most common,, this being pre- eminently true of the Finger lakes and to a large extent of the Adirondacks. It is well known that most of the larger lakes, espe- cially those of the linear type, occupy portions of preglacial stream channels. All the existing lakes are due, either directly or indi- rectly, to glacial action, and among the ways by which such bodies of water were formed are these: by building dams of glacial drift across old river channels; by ice erosion; and by the filling of the numerous depressions which were formed by irregular deposition of the drift (kettle holes, etc.). Hundreds of small lakes, often. Fig. 34 The time of the Nipissing Great Lakes and Champlain submer- gence. The shaded area on the east was covered by sea water. After Taylor not more than mere ponds in size, belong to the last named type, while most of the large lakes are due chiefly to the existence of drift dams. Much has been written concerning the origin of the Finger lakes, and only the briefest summary will here be given. All are agreed that the lakes of this remarkable group occupy preglacial valleys, most of which, at least, contained north-flowing streams. These lakes have dams of glacial drift across their lower (north) ends, and the dams have largely contributed to the formation of the lakes, being in some cases perhaps the sole cause of the lakes. In the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum. Albany : University of the State of New York
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